1:  [TestClass]
   2:  public class MyTests
   3:  {
   4:      static System.Threading.ManualResetEvent m_Trigger
   5:          = new System.Threading.ManualResetEvent(false);
   6:   
   7:      [TestMethod]
   8:      private static void MyTest()
   9:      {
  10:          Exception ex = null;
  11:          var _Item = new MyClass();
  12:          _Item.AsyncCompleted += (s, e) =>
  13:          {
  14:              // this delay is important in case it is too fast
  15:              System.Threading.Thread.Sleep(100);
  16:              ex = e.Error;
  17:              m_Trigger.Set();
  18:          };
  19:          _Item.DoAsync();
  20:          m_Trigger.WaitOne();
  21:          Assert.IsNull(ex);
  22:      }
  23:  }